diff --git a/less/forms.less b/less/forms.less
index d2d089c30d..e623c42e50 100644
--- a/less/forms.less
+++ b/less/forms.less
@@ -226,7 +226,12 @@ input[type="checkbox"],
   }
 }
 
+
 // Form control sizing
+//
+// Build on `.form-control` with modifier classes to decrease or increase the
+// height and font-size of form controls.
+
 .input-sm {
   .input-size(@input-height-small; @padding-small-vertical; @padding-small-horizontal; @font-size-small; @line-height-small; @border-radius-small);
 }